Onelink Safe and Sound, Green Light

Cupertino, April 7, 2020

I have three of these smoke / CO detectors. Two of them behave the way I want, and the third does not, and I don't realize why there is a difference.

I have all three night lights set to light up at sunset and go out at sunrise. On two of them, when the night light is off, there is no light at all (preferred behavior). Third, every time the night light is off, there is a dim green light that lights up (unintended behavior). From research, it seems that green means that everything is fine.

How do I make the third one behave like the first two?

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